/*
 * Copyright (C) 2015-2018 Alibaba Group Holding Limited
 */



#ifndef MBEDTLS_PLATFORM_H
#define MBEDTLS_PLATFORM_H

#if !defined(MBEDTLS_CONFIG_FILE)
    #include "config.h"
#else
    #include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_HAVE_TIME)
    #include "mbedtls/platform_time.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \name SECTION: Module settings
 *
 * The configuration options you can set for this module are in this section.
 * Either change them in config.h or define them on the compiler command line.
 * \{
 */

#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
#if defined(_WIN32)
#define MBEDTLS_PLATFORM_STD_SNPRINTF   mbedtls_platform_win32_snprintf /**< Default snprintf to use  */
#else
#define MBEDTLS_PLATFORM_STD_SNPRINTF   snprintf /**< Default snprintf to use  */
#endif
#endif
#if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
#define MBEDTLS_PLATFORM_STD_PRINTF   printf /**< Default printf to use  */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
#define MBEDTLS_PLATFORM_STD_FPRINTF fprintf /**< Default fprintf to use */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
#define MBEDTLS_PLATFORM_STD_CALLOC   calloc /**< Default allocator to use */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_FREE)
#define MBEDTLS_PLATFORM_STD_FREE       free /**< Default free to use */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_EXIT)
#define MBEDTLS_PLATFORM_STD_EXIT      exit /**< Default exit to use */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_TIME)
#define MBEDTLS_PLATFORM_STD_TIME       time    /**< Default time to use */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS  EXIT_SUCCESS /**< Default exit value to use */
#endif
#if !defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE  EXIT_FAILURE /**< Default exit value to use */
#endif
#if defined(MBEDTLS_FS_IO)
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
#define MBEDTLS_PLATFORM_STD_NV_SEED_READ   mbedtls_platform_std_nv_seed_read
#endif
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE  mbedtls_platform_std_nv_seed_write
#endif
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_FILE)
#define MBEDTLS_PLATFORM_STD_NV_SEED_FILE   "seedfile"
#endif
#endif /* MBEDTLS_FS_IO */
#else /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
#if defined(MBEDTLS_PLATFORM_STD_MEM_HDR)
#include MBEDTLS_PLATFORM_STD_MEM_HDR
#endif
#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */


/* \} name SECTION: Module settings */

/*
 * The function pointers for calloc and free
 */
#if defined(MBEDTLS_PLATFORM_MEMORY)
#if defined(MBEDTLS_PLATFORM_FREE_MACRO) && \
    defined(MBEDTLS_PLATFORM_CALLOC_MACRO)
#define mbedtls_free       MBEDTLS_PLATFORM_FREE_MACRO
#define mbedtls_calloc     MBEDTLS_PLATFORM_CALLOC_MACRO
#else
/* For size_t */
#include <stddef.h>
extern void *(*mbedtls_calloc)(size_t n, size_t size);
extern void (*mbedtls_free)(void *ptr);

/**
 * \brief   Set your own memory implementation function pointers
 *
 * \param calloc_func   the calloc function implementation
 * \param free_func     the free function implementation
 *
 * \return              0 if successful
 */
DLL_TLS_API int mbedtls_platform_set_calloc_free(void *(*calloc_func)(size_t, size_t),
        void (*free_func)(void *));
#endif /* MBEDTLS_PLATFORM_FREE_MACRO && MBEDTLS_PLATFORM_CALLOC_MACRO */
#else /* !MBEDTLS_PLATFORM_MEMORY */
#define mbedtls_free       free
#define mbedtls_calloc     calloc
#endif /* MBEDTLS_PLATFORM_MEMORY && !MBEDTLS_PLATFORM_{FREE,CALLOC}_MACRO */

/*
 * The function pointers for fprintf
 */
#if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
/* We need FILE * */
#include <stdio.h>
extern int (*mbedtls_fprintf)(FILE *stream, const char *format, ...);

/**
 * \brief   Set your own fprintf function pointer
 *
 * \param fprintf_func   the fprintf function implementation
 *
 * \return              0
 */
DLL_TLS_API int mbedtls_platform_set_fprintf(int (*fprintf_func)(FILE *stream, const char *,
        ...));
#else
#if defined(MBEDTLS_PLATFORM_FPRINTF_MACRO)
#define mbedtls_fprintf    MBEDTLS_PLATFORM_FPRINTF_MACRO
#else
#define mbedtls_fprintf    fprintf
#endif /* MBEDTLS_PLATFORM_FPRINTF_MACRO */
#endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */

/*
 * The function pointers for printf
 */
#if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
extern int (*mbedtls_printf)(const char *format, ...);

/**
 * \brief   Set your own printf function pointer
 *
 * \param printf_func   the printf function implementation
 *
 * \return              0
 */
DLL_TLS_API int mbedtls_platform_set_printf(int (*printf_func)(const char *, ...));
#else /* !MBEDTLS_PLATFORM_PRINTF_ALT */
#if defined(MBEDTLS_PLATFORM_PRINTF_MACRO)
#define mbedtls_printf     MBEDTLS_PLATFORM_PRINTF_MACRO
#else
#define mbedtls_printf     printf
#endif /* MBEDTLS_PLATFORM_PRINTF_MACRO */
#endif /* MBEDTLS_PLATFORM_PRINTF_ALT */

/*
 * The function pointers for snprintf
 *
 * The snprintf implementation should conform to C99:
 * - it *must* always correctly zero-terminate the buffer
 *   (except when n == 0, then it must leave the buffer untouched)
 * - however it is acceptable to return -1 instead of the required length when
 *   the destination buffer is too short.
 */
#if defined(_WIN32)
/* For Windows (inc. MSYS2), we provide our own fixed implementation */
DLL_TLS_API int mbedtls_platform_win32_snprintf(char *s, size_t n, const char *fmt, ...);
#endif

#if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
extern int (*mbedtls_snprintf)(char *s, size_t n, const char *format, ...);

/**
 * \brief   Set your own snprintf function pointer
 *
 * \param snprintf_func   the snprintf function implementation
 *
 * \return              0
 */
DLL_TLS_API int mbedtls_platform_set_snprintf(int (*snprintf_func)(char *s, size_t n,
        const char *format, ...));
#else /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
#if defined(MBEDTLS_PLATFORM_SNPRINTF_MACRO)
#define mbedtls_snprintf   MBEDTLS_PLATFORM_SNPRINTF_MACRO
#else
#define mbedtls_snprintf   snprintf
#endif /* MBEDTLS_PLATFORM_SNPRINTF_MACRO */
#endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */

/*
 * The function pointers for exit
 */
#if defined(MBEDTLS_PLATFORM_EXIT_ALT)
extern void (*mbedtls_exit)(int status);

/**
 * \brief   Set your own exit function pointer
 *
 * \param exit_func   the exit function implementation
 *
 * \return              0
 */
DLL_TLS_API int mbedtls_platform_set_exit(void (*exit_func)(int status));
#else
#if defined(MBEDTLS_PLATFORM_EXIT_MACRO)
#define mbedtls_exit   MBEDTLS_PLATFORM_EXIT_MACRO
#else
#define mbedtls_exit   exit
#endif /* MBEDTLS_PLATFORM_EXIT_MACRO */
#endif /* MBEDTLS_PLATFORM_EXIT_ALT */

/*
 * The default exit values
 */
#if defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
#define MBEDTLS_EXIT_SUCCESS MBEDTLS_PLATFORM_STD_EXIT_SUCCESS
#else
#define MBEDTLS_EXIT_SUCCESS 0
#endif
#if defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
#define MBEDTLS_EXIT_FAILURE MBEDTLS_PLATFORM_STD_EXIT_FAILURE
#else
#define MBEDTLS_EXIT_FAILURE 1
#endif

/*
 * The function pointers for reading from and writing a seed file to
 * Non-Volatile storage (NV) in a platform-independent way
 *
 * Only enabled when the NV seed entropy source is enabled
 */
#if defined(MBEDTLS_ENTROPY_NV_SEED)
#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
/* Internal standard platform definitions */
DLL_TLS_API int mbedtls_platform_std_nv_seed_read(unsigned char *buf, size_t buf_len);
DLL_TLS_API int mbedtls_platform_std_nv_seed_write(unsigned char *buf, size_t buf_len);
#endif

#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
extern int (*mbedtls_nv_seed_read)(unsigned char *buf, size_t buf_len);
extern int (*mbedtls_nv_seed_write)(unsigned char *buf, size_t buf_len);

/**
 * \brief   Set your own seed file writing/reading functions
 *
 * \param   nv_seed_read_func   the seed reading function implementation
 * \param   nv_seed_write_func  the seed writing function implementation
 *
 * \return              0
 */
DLL_TLS_API int mbedtls_platform_set_nv_seed(
            int (*nv_seed_read_func)(unsigned char *buf, size_t buf_len),
            int (*nv_seed_write_func)(unsigned char *buf, size_t buf_len)
);
#else
#if defined(MBEDTLS_PLATFORM_NV_SEED_READ_MACRO) && \
    defined(MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO)
#define mbedtls_nv_seed_read    MBEDTLS_PLATFORM_NV_SEED_READ_MACRO
#define mbedtls_nv_seed_write   MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO
#else
#define mbedtls_nv_seed_read    mbedtls_platform_std_nv_seed_read
#define mbedtls_nv_seed_write   mbedtls_platform_std_nv_seed_write
#endif
#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
#endif /* MBEDTLS_ENTROPY_NV_SEED */

#ifdef __cplusplus
}
#endif

#endif /* platform.h */
